Question

The photo electric work functions of some metals are given below. Na-3.0x10^-19, k-3.0x10^-19, Mo-3.0x10^-19, Ni-3.0x10^-19 which of the above metals will eject electrons when irrediated with light of wave length 330nm? ​

Answer 1

Explanation:

E=

λ

hc

=

300×10

−9

6.6×10

−34

×3×10

8

J

E(in eV)=

300×10

−9

×1.6×10

−19

6.6×10

−34

×3×10

8

=4.125 eV

For photoelectric effect to occur, the energy of a photon must be greater than the work function of the metal.

So, the number of metals showing photo-electric effects will be (4) i.e., Li, Na, K, Mg.

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